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Eliminate the "store" global variable

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Also, move a few free-standing functions into StoreAPI and Derivation.

Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)
This commit is contained in:
Eelco Dolstra 2016-02-04 14:28:26 +01:00
parent 4f7824c58e
commit c10c61449f
36 changed files with 511 additions and 458 deletions
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2
src/libstore/download.cc
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@ -188,7 +188,7 @@ DownloadResult downloadFile(string url, const DownloadOptions & options)
}
Path downloadFileCached(const string & url, bool unpack)
Path downloadFileCached(ref<StoreAPI> store, const string & url, bool unpack)
{
Path cacheDir = getEnv("XDG_CACHE_HOME", getEnv("HOME", "") + "/.cache") + "/nix/tarballs";
createDirs(cacheDir);